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Finding the Fourth Proportional to 15,121.69, 20,868.03 and 9,153.41

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Solution

The fourth proportional to 15,121.69, 20,868.03 and 9,153.41 is: 12,631.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,121.69 : 20,868.03 = 9,153.41 : x
  2. Step 2: Convert to fraction form
    15,121.69/20,868.03 = 9,153.41/x
  3. Step 3: Cross multiply
    15,121.69x = 20,868.03 × 9,153.41
  4. Step 4: Simplify right side
    15,121.69x = 191,013,530.14
  5. Step 5: Solve for x
    x = 191,013,530.14/15,121.69
  6. Step 6: Final answer
    x = 12,631.76

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.